Application of Pinch Force to the Separation of Inclusion Particles from Liquid Steel

Shoji Taniguchi, J. Keith Brimacombe

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)


The pinch force which is one of the most common electromagnetic forces in the metallurgical field can be generated by imposing an electrical current on a liquid metal. In this force field, electrically nonconductive particles suspended in a liquid metal experience a force in the opposite direction to the pinch force, and are squeezed out from the liquid metal. In this study, the above principle was applied to the separation of nonmetallic inclusion particles from liquid steel. Firstly, the separation efficiency, η, of nonmetallic inclusion particles from the liquid steel flowing in a circular pipe was calculated by the trajectory method under laminar flow conditions. The value of η was found to be a function of VR, [formula omitted] and r1,δ, where r1 is the radius of the pipe, δ is the skin depth and VR, Cl, DR, Re and Z are nondimensional parameters. The estimated value of η in a continuous casting tundish equipped with a channel-induction furnace was greater than 95% for particles with a diameter over 60 μm. Secondly, the value of η for a square pipe was computed by the concentration method. In this case, the value of η was found to be a function of V'r and [fromula omitted] at x1/δ=0, where x1 is the half width of the square pipe. However, with increasing x1/δ, secondary flows appeared in a cross section of the pipe because of the skin effect. These flows were found to increase the value of η by transporting the particles in the inner region toward the wall.

Original languageEnglish
Pages (from-to)722-731
Number of pages10
JournalIsij International
Issue number9
Publication statusPublished - 1994
Externally publishedYes


  • clean steel
  • electromagnetic force
  • inclusion separation
  • nonmetallic inclusion
  • pinch force
  • pipe flow
  • tundish heater

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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